Alright, I can't take much action yet, b/c we're in the middle of a drain/refill due to high CYA (110) - thank you dichlor. I'm all-in with TFP, now, so just liquid chlorine for us now! But I wanted to put this out there so I can have a plan of attack as soon as the pool is full again.
We've been through war with this pool so far this year. A tree fell on it, the wiring to the pump shorted out, the waste valve leaked like crazy when filtering, and there was a leak in the pressure side return lines causing us to lose a ton of water when the pump was running. All that's taken care of now. We were running the pump 24/7 once the wiring and leaks were fixed to clear an algae bloom, with no water loss. Now, when we turn the pump off, we're noticing a water loss. A couple of inches over the course of a few rainy days.
There is air in the pump. We have to bleed the filter every few minutes. There are air bubbles coming out of the return line when the pump is on. So definitely suction leak, right? I was greatly encouraged to read that the odds of it being an underground leak are slim. But we don't see water coming out of any of the pipes or dripping down the equipment. We only lose water when the pump is not running now. Where is the water going? Should I dig down to the base of the pipe coming out of the ground to the pump to see if the ground is wet?
If we didn't have a friend's going away party scheduled for next Sunday, we probably would've just put a cover back on by now and waited till next year, lol...